WebApp: Fix channel-detail page for non-owned channels

webapp/src/app/core/services/api.service.ts

@@ -6,6 +6,8 @@ import {
   User,
   UserWithExtra,
   UserPreview,
+  ChannelPreview,
+  KeyTokenPreview,
   Message,
   MessageListParams,
   MessageListResponse,
@@ -98,6 +100,14 @@ export class ApiService {
     return this.http.get<ClientPreviewResponse>(`${this.baseUrl}/preview/clients/${clientId}`);
   }
 
+  getChannelPreview(channelId: string): Observable<ChannelPreview> {
+    return this.http.get<ChannelPreview>(`${this.baseUrl}/preview/channels/${channelId}`);
+  }
+
+  getKeyPreview(keyId: string): Observable<KeyTokenPreview> {
+    return this.http.get<KeyTokenPreview>(`${this.baseUrl}/preview/keys/${keyId}`);
+  }
+
   // Channel endpoints
   getChannels(userId: string, selector?: ChannelSelector): Observable<ChannelListResponse> {
     let params = new HttpParams();